Detection and location of cracks using loss of reciprocity in ultrasonic waves propagation

Scalerandi, Marco; Gliozzi, Antonio; Bruno, Caterina Letizia Elisabetta

doi:10.1121/1.3664103

Cited by 12 publications

(6 citation statements)

References 19 publications

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“…Consolidated granular media, both natural (rocks) or man-made (building materials, e.g., concrete, and ceramics produced by sintering), exhibit a complicated, nonlinear elastic behavior. The observed phenomenology includes hysteresis in the stress-strain constitutive equation, [1][2][3] excitation amplitude-dependent resonance frequencies, [4][5][6] the generation of harmonics, 7 the loss of validity of the superposition 8,9 and reciprocity 10 principles, and conditioning/relaxation phenomena. [11][12][13][14] Nonlinear elasticity parameters measured in various types of experiments are very sensitive to changes in the microstructure, including changes due to damage processes, e.g., cracking.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear elastic response of thermally damaged consolidated granular media

Scalerandi

Griffa

Antonaci

et al. 2013

Journal of Applied Physics

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The mechanical properties of consolidated granular media are strongly affected by large temperature changes which induce the development and localization of stresses, leading in turn to damage, e.g., cracking. In this work, we study the evolution of linear and nonlinear elasticity parameters when increasing the temperature of the thermal loading process. We prove the existence of a link between linear and nonlinear elasticity properties. We show that the change of the nonlinear elasticity parameters with the increase in the thermal loading is larger at the lower temperatures than the corresponding change for the linear parameters, suggesting that nonlinear elasticity can be exploited for early thermal damage detection and characterization in consolidated granular media. We finally show the influence of grain size upon the thermal damage evolution with the loading temperature and how this evolution is mirrored by the nonlinear elasticity parameters. V

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Section: Introductionmentioning

confidence: 99%

Nonlinear elastic response of thermally damaged consolidated granular media

Scalerandi

Griffa

Antonaci

et al. 2013

Journal of Applied Physics

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“…These features are exploited by the scaling subtraction method (SSM) 19,20 and nonlinear loss of reciprocity (NLR) based methods. 21 The goal of this paper is first to show the existence of strain amplitude thresholds for nonlinearity detection. Section II describes the way these thresholds depend on the adopted method for the data analysis.…”

Section: Introductionmentioning

confidence: 99%

Influence of noise on the threshold for detection of elastic nonlinearity

Bentahar

Guerjouma

Idijmarene

et al. 2013

Journal of Applied Physics

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Wheel/rail noise generation due to nonlinear effects and parametric excitationNonlinear effects on the propagation of elastic waves in hysteretic media are of great importance, with applications in imaging and monitoring evolution of damage/phase transitions/biological features. However, excitation amplitudes are an issue in order to improve performances of the techniques. Noise effects in the signals can be stronger than the generated nonlinear effects, thus rendering difficult the nonlinear analysis. Here, we analyze the link between the amplitude threshold for detection of nonlinear effects and different kinds of noises, which might be present in experiments. We also discuss the implications in the intrpretation of experiments. V C 2013 American Institute of Physics. [http://dx.

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“…23,26,27 On the other side, slow dynamics is usually understood as the dependence of an observable quantity on time at a constant amplitude of excitation. Typical features are: Conditioning, which results in a transition of the system in time to a new elastic state, which is the equilibrium state for the given amplitude of excitation; 5,28,29 relaxation, which is the slow recovery in time of the original elastic state when the excitation is removed.…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium phenomena in damaged media and their effects on the elastic properties

Scalerandi

Gliozzi

Bruno

et al. 2012

The Journal of the Acoustical Society of America

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Concrete, particularly if damaged, exhibits a peculiar nonlinear elastic behavior, which is mainly due to the coupling between nonequilibrium and nonlinear features, the two of which are intrinsically connected. More specifically, the formulation of a constitutive equation able to properly predict the dynamic behavior of damaged concrete is made difficult by the concomitant presence of two mechanisms: The modification of the microstructure of the medium and the transition to a new elastic state caused by a finite amplitude excitation (conditioning). Memory of that new state is kept when the excitation is removed, before relaxation back to the original elastic state takes place. Indeed, besides accounting for linear and nonlinear parameters, a realistic constitutive equation to be used in reliable prediction models should take into account nonequilibrium effects. Specific parameters, sensitive to finite amplitude excitations, should be introduced to provide information about conditioning effects. In this paper, experimental results indicating that nonlinearity of damaged concrete is memory-dependent will be presented and the implications of such findings in the development of physical models, with relevant outcomes for the characterization of hysteretical features, will be discussed.

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Detection and location of cracks using loss of reciprocity in ultrasonic waves propagation

Cited by 12 publications

References 19 publications

Nonlinear elastic response of thermally damaged consolidated granular media

Nonlinear elastic response of thermally damaged consolidated granular media

Influence of noise on the threshold for detection of elastic nonlinearity

Nonequilibrium phenomena in damaged media and their effects on the elastic properties

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